She said: "I was in bed about 20 minutes ago. I have absolutely no idea what's in the show but shall we find out together?"

After reading the line-up from an autocue, she joked: "It looks quite good. I'm going to stay and do it!"

The presenter admitted she was very confused when her phone started ringing so early this morning but insisted that she thought it was "brilliant" she was asked to help out.

Piers then quipped that Kate should present the show in a Scottish accent in honour of Lorraine, but the host stressed that that probably wasn't a good idea as she might offend the star.

However, he wasn't as concerned and promised he would be more than happy to offend Lorraine with his attempt at a Scottish accent as soon as she is well.

Commenting on how ITV's Lorraine would go without Kelly, Piers jokingly added: "This is complete chaos. We have no idea what is happening – it's a bit like a normal day on Good Morning Britain really!"

Lorraine is on ITV, weekdays at 8.30am. Good Morning Britain is on ITV, weekdays at 6am.